13-Letter Words Matching ________O__G_

There are 21 13-letter words that match ________O__G_. 3 are common words, such as BIOTECHNOLOGY and ENDOCRINOLOGY. A rarer one is THEATERGOINGS. In this set, O is the most frequent open letter (20 words). 4 words contain a doubled letter.

Full list 21

biotechnologyendocrinologyophthalmologygeochronologygeomorphologyhelminthologynumismatologypaleethnologyphenomenologypsychobiologyroentgenologysedimentologysplanchnologysystematologythremmatologychronobiologyconcertgoingscryptozoologyecophysiologyepizootiologytheatergoings

About this list

Words
21 (3 common words)
Common example
biotechnology
Rare example
theatergoings
Doubled letters
4
Ending in S
2
Most frequent letter
O (20)

Questions

How many 13-letter words matching ________o__g_ are there?

21. 3 of them are common words.

What is a common example?

BIOTECHNOLOGY is among the common words in this set.